Patents by Inventor Masataka Miwa

Masataka Miwa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for estimating a life of apparatus under narrow-band random stress variation
    Patent number: 6532421
    Abstract: A method for estimating the life of an apparatus under a random stress amplitude variation, involving determining a probability density function of a cumulated damage quantity and estimating the life of the apparatus on the basis of the probability density function, characterized by: approximating a damage coefficient indicative of a damage quantity per unit by a linear expression when the random stress amplitude variation is in a narrow band; and representing the random stress amplitude variation &sgr;(t)(instantaneous) in terms of the sum of a time averaged value &sgr;(t)(mean) and a stochastic variation &sgr;′.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: March 11, 2003
    Assignee: Toho Gas Co., LTD
    Inventor: Masataka Miwa
  • Method for estimating a life of apparatus under narrow-band random stress variation
    Publication number: 20010034581
    Abstract: A method for estimating the life of an apparatus under a random stress amplitude variation, involving determining a probability density function of a cumulated damage quantity and estimating the life of the apparatus on the basis of the probability density function, characterized by: approximating a damage coefficient indicative of a damage quantity per unit by a linear expression when the random stress amplitude variation is in a narrow band; and representing the random stress amplitude variation &sgr;(t)(instantaneous) in terms of the sum of a time averaged value &sgr;(t)(mean) and a stochastic variation &sgr;′.
    Type: Application
    Filed: December 4, 2000
    Publication date: October 25, 2001
    Applicant: TOHO GAS CO., LTD
    Inventor: Masataka Miwa